FN Archimer Export Format
PT J
TI Open ocean regimes of relative dispersion
BT 
AF OLLITRAULT, Michel
   GABILLET, Céline
   DE VERDIERE, Alain Colin
AS 1:1;2:2;3:3;
FF 1:PDG-DOP-DCB-OPS-LPO;2:;3:;
C1 IFREMER, Ctr Brest, Lab Phys Oceans, F-29280 Plouzane, France.
   Inst Rech Ecole Navale, F-29240 Brest, France.
   Univ Bretagne Occidentale, Lab Phys Oceans, F-29285 Brest, France.
C2 IFREMER, FRANCE
   IRENAV, FRANCE
   UBO, FRANCE
SI BREST
SE PDG-DOP-DCB-OPS-LPO
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.061
TC 59
UR https://archimer.ifremer.fr/doc/2005/publication-456.pdf
LA English
DT Article
DE ;Taylor dispersion;Dispersion;Atlantic circulation;Particule pairs
AB As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D-2 and D-4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a Richardson regime (D-2 similar to t(3) asymptotically) for r.m.s. separation distances between 40 and 300 km, in agreement with a D-4/3 law. At early times, and for smaller separation distances, an exponential growth, in agreement with a D-2 law, was briefly observed but only for the eastern cluster (with an e-folding time around 6 days). After a few months or separation distances greater than 300km, the relative dispersion slowed down naturally to the Taylor absolute dispersion regime.
PY 2005
PD JUL
SO Journal of fluid mechanics
SN 0022-1120
PU Cambridge univ. Press
VL 533
UT 000230698600018
BP 381
EP 407
DI 10.1017/S0022112005004556
ID 456
ER

EF